Why is stainless steel magnetic

Many customers often think that magnet adsorption stainless steel, to verify its advantages and disadvantages and authenticity, no magnetic absorption, that is good, genuine; Suction has magnetic, it is considered to be a fake. In fact, this is a very one-sided, not really wrong discrimination method, I hope the following content to help you! There are many kinds of stainless steel, at room temperature according to the structure can be divided into several categories: 1. Austenitic body type: such as 304, 321, 316, 310, etc. 2. Martensite or ferritic body type: such as 430, 420, 410, etc. The Austenitic form is non-magnetic or weakly magnetic, and the martensite or ferrite is magnetic. Usually used as a decorative stainless steel pipe, stainless steel plate of stainless steel is mostly 304 Austenitic type material, generally speaking is no magnetic or weak magnetic, but due to smelting caused by chemical composition fluctuations or processing state may also appear magnetic, but this can not be considered fake or unqualified, what is the reason? As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to improper composition segregation or heat treatment during smelting, a small amount of martensite or ferrite will be caused in austenitic 304 stainless steel. In this way, 304 stainless steel will have a weak magnetic. In addition, 304 stainless steel after cold processing, the structure will also be converted to martensite, the greater the deformation degree of cold processing, the more martensite transformation, the greater the magnetic steel. As a batch of steel belt, the production of φ103 pipe, no obvious magnetic induction, the production of φ9.5 pipe. Because of the ling bending deformation is larger magnetic sense is obvious, the production of square rectangular tube due to the amount of deformation is larger than the round tube, especially the corner part, the deformation is more intense magnetic more obvious. In order to completely eliminate the magnetism of 304 steel caused by the above reasons, the stable austenite structure can be restored by high temperature solution treatment, so as to remove the magnetism. In particular, the magnetic 304 stainless steel caused by the above reasons, and other materials of stainless steel, such as 430, carbon steel magnetic is not the same level, that is to say, the magnetic 304 steel always shows weak magnetic.

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